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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9301fa1a83dc7d103ff085e17fb1fbfa88f534f9cdefdd2da0a60898731140a2' 
  AND token = 'GDCwFHafdE5pYcRjocSC7h3yMI1gKtFpkaliI2gRi4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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