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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9d9dda49b85cc97523e74150027126df5739121cbc43db6f6b18a37199c480' 
  AND token = '8kRkbEfbpFF1PogD75fC8Mm6UGbFA9/SJ5CQE63D7WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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