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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a2ad8f46e9fb8100c6169c25a7e93d4edbb6134df12ba4321484d7cb653819' 
  AND token = '+GBihTjFIIAElz7iPUQYiTPfbRy7Ipp3yLOlrN+5YSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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