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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3fbeaef8250fe60f50051519de5b51024a488611943c06d26b8f3382ed5415' 
  AND token = 'tF1k+362ldxwrngS2uKqACQLJ64u8yueFZ0eGC5nxnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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