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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58c7f355297984d4acf3a97a41f38ad3b20762508f742c6e93597983d149b14' 
  AND token = 'eeYEpRvsa9xl7OeOtyzSV4Cm5oChn/ItNjXft8HS8ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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