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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a435d2d5543639467d7f6f1b73b4185ea5b5ca0b007f3b305c40a7a0e007ca99' 
  AND token = 'kx7/ybtJ1K1lGi98lRzDOA4FXkksQOZ7dN5n5bTQzFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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