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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9322e76e8b0c0fc1cf45d989eb3f244e7ae0dd5e6c23450f81648f9917a04422' 
  AND token = '32DHzEpmjSpPH5tNiDQMFeuGxfybg+lptO+PL+bryxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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