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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c97526c616dd5e773669b17239ccdbad6335a8863325b770c6a5034d23e65a' 
  AND token = 'BmDvg9Pc2axt/f9nmdGWLWwYLqgGj8w7P9uo3HDFDQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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