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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafd12097e673a1d8ec71cba420dfa9f36b5fe7008efc22a8847dcd38313a438' 
  AND token = 'xTYgEurC5QRIZf2xjaYOh490g/Tqz+PTdpBHkp1tza4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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