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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019b0dcd07a28560709a8dfcae38f824dfef441361121544027e8243455169eb' 
  AND token = '9dgaI41xOtIiPce1URjplTmm1Yesx7pCYFrLeO5+niI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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