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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a65c7d79e0d4f156c4aef6d634d74c6137b0bbf2e333998e0bbc6b0f8d7b31b' 
  AND token = '7fjKrXQaHNJXy05YS0xHxBye6HLKjdDz4xIujPZQv2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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