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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a54f45f320062c8796d4dc85e405bce0f818546e242e9077b91be7129d32e072' 
  AND token = 'w+w23FF4Osw4AfMl8yO2yupG1lBzfOWEFvh3hEu7rHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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