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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593f43ef7a29fef31ce01cb9e3bbfc424b401fecab26eb5c53070bc94362480a' 
  AND token = 'RTrftbS6o6Q0PUARkDK3ARFHqD5ZONiOnaLCaNmIDLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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