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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc5ff6e88cbeb33dde7523877935ac2c1a18fd32dd83c852d6b36142bd49df4' 
  AND token = '8jMss5KQWcN224E04c7DARj/GMg8KXypbFDApH6izf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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