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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6c4f75d5c73434b7c0d569300b09766cfa9c1f1ecb1d552c45c5d68817b37a' 
  AND token = '80sCUgBRq8FIgOjV4flG3H4ukv7hmJjLFX99mSux5d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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