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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8644ce9bb8ec610b7fe8eeeb142f64e182ad7838376deb64b3b15711f581a93f' 
  AND token = 'plhfuEsbQ3K4XsNlXPH8OBktPGHMyH/piW3a/7kkuDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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