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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9d0665ba2ed9939e8ddd4a22f49668eda60678cf71f29ea18535125a68cd28' 
  AND token = 'u21COazsGzL6v743NXc5Ucx9Yc6e0/DijUtbZpPfhBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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