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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d9b79ca631256a3836993b4a72174765189b9ae641fc6ff8d281f0934a2253' 
  AND token = 'owXaSjRkpFSAr2BpDhXof6eWrO6WnL71S4ZXj/uMFHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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