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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2b5c68770a3519dc6c7ebf09ef3c6b575f18f9236b10e52e8fee70082dd752' 
  AND token = 'dtLfksiqN0vkGVc6LIEk7Ev62Q0bUs/42wwJOx6UunY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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