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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82bf64d8f64ff50f23bb63a23789bcd2ea0d9a9c9c4839446969c7146ed66572' 
  AND token = 'uA3jqf14tIgDO7e9X0JJ1uxCVXnyFwVu5ajOtMwG7gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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