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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63db6419a4bace8877269a5cd28fa1db3f182ca2893c7fc9dfe33c419f180c20' 
  AND token = 'wb4m7W3VSJtHmk3ZuoEdngFCqIuZPDSRLsNqbVF8jic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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