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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018a0ea671e31e3728785f514c1a354000514f17690f73c47bfbffc750f2693f' 
  AND token = '3P0zAAeCYSDo24yidB5Lxpb6x6/OCWn9IzVC9f4KvbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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