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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc19517b6901d39dc5d344ba8c8f8c538118fa31b9694a7fd92c7a8fd7c238d' 
  AND token = 'NtbOasN0eWCn4/BIy2numLpStUqgQo9DVnCIKED2mpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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