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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883c9e3e24084073ad58cf621807172495b4223e01b4af7fd442ae24e0acaef6' 
  AND token = '8+gM8fC0Ayx9ZRXUwsDozKnVYssy0l0/kClhvzflpfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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