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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa55cd08dec141146b4708db735f8715758de4da68030073bf7083c515155929' 
  AND token = 't0cR4a+W+X8pIJWE5u7qc6tUrHVitscAHvU2L7twPj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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