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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f23d34306a421b4e926263da40f5ad6b53cf5388a71fcdcff143e2b9d0906a' 
  AND token = 'MsgNQIW3cLcYYhf+O5KjejFImLfexpq+ZPmVv360kjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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