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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7d08f6a7175771d812f7da86201bdc94e1cf6ce2b609391548172d4957416a' 
  AND token = 'hx7gkfR47wroiVbP8jtD8KGzaiLqeUIUexjczJ7o7Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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