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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822b239725f5e117b6feda7845b0d0c337a8eba8e29c642fb83aafb6483691d4' 
  AND token = 'GnpPEKDZiivft0V0R6jjwPH3bOZuVP73pDxj3tvLvUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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