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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba7cb4771bb210332ed2dca78e3fc2590792e87143e8216606a8f64d6751933' 
  AND token = 'iCmzDUi3CrZng73eQ/Vy5VeVg1NlKXpeETRy3BH8ZGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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