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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd74634521158a0bd70345dc3c3489af8ae747506ee6d471c1b33a60f7c14d06' 
  AND token = 'fY9YDTMKKoW9Vw3GYhTT8BMJrtIgpMDKNh5c+1ZKfT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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