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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6344eb16f5c6157a7c40723d2f1d19805fea583fbec60d347ddc2a7f078afb80' 
  AND token = 'abydFvavrhmyAqr9swRf32UfWrJfywb84fFWUsI93vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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