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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e583702af484bdd059fa88ea87cf17f4fe7d9c89e5997e4610e4f1b60e50d95a' 
  AND token = 'SgJxbjro7UKsNbwOCvqOSWMOxYwZbga/BLV8liwMd98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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