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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af170ac742dba041fd5884a24209f5f31f3c1c12a6f8e68ca76cd357831fe532' 
  AND token = 'l3oqeCBBr9DVztaPwDy/SvgJTTADP0pu5UD5lfAsEGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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