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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ce6f0de8559b9d5ba436527f6c2986cb43d21e66db9ef55a7bb0df7bdc42d4' 
  AND token = 'z5yoZ7pBWxcCMt9A+a7h8uLr5hrQa9nXKznsFNL3CF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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