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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b936fa1e00607f2502395f6c3eda563a766bf42abe3e90e6fc4d295fffbcb3' 
  AND token = 'XXmRJDu1sortOOZFnAH76Dnny445gXgZ/j52mkhZE6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}