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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c4cb54289a96a8206ae0e8aa3de8bc3593863e71eeb1ac24ac80f9af41fd88' 
  AND token = 'S8FGHybSZIXeT6dAXi4MLtHEjuIAaedPTejEEkkKoD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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