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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aaeae50d7c575f8aa089eee54223d16856230076ad56a088297b5ae3419e431' 
  AND token = 'ykyj8kn4HR9f2w0RguVLrP1ejhekFpQzx/NzprxG/is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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