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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cbd6f603d4606dfc13468d1e00a58726a6b81626bfedf3b0ec7cda6f1f3c5d1' 
  AND token = 'Yl+di8C2ky0DZKNVIEGt+B+lmFaoKmQW6Mh62qEicjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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