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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb0b716258684bc63483f7b6e8bfe122d18c884c44fe8b05568cf2e5a05686b' 
  AND token = '+peUsfB9pRS3PpNF/QtI1AlewNfeAopUWI892GaJw8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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