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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd91acea0665049d96196badb9c87c58b839d8ee4ca36dcf66bcae5a336abd2' 
  AND token = 'm1nl2bwkrr2Y/r6ovpzijSqw3UEZWk/0Q+DPm3qMaDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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