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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9474d8f1343321422302d632f2f0dadcd20788d6ffb7cda89e207ecf8ec6ff' 
  AND token = 'w1WY0ydMeRvpN4Zm4Koq3PQUO7XzAknX3lEDaGNL4CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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