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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb2814c54fecbe11588c290426882a13e6cbf3b84945d417573576f310cf161' 
  AND token = '2c+o1746tVP0/S7fnEpCd5tWX2mzJYU//sE0zNbVtpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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