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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ddb48b892cd7848a5fbada6101b9fcd87899fdfbfbed5ca86cba09f2eae96e' 
  AND token = '21/kLjeoAIU6P8raTBiKN8p0mJd6JsHJtu6SZ3wZqc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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