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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c56e36e9c5d46a5124fa94e5173a973b204cc10162242fd0b0ca9cff41fcbe' 
  AND token = 'k/XO7LXEYnQIPlypQ6a+mUyMCnJJmqs8TAqepRgh5Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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