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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de320bb2fd04f0b011dac288726ab3ccbc35931c23bd7b1f17e9aeb2791acfc5' 
  AND token = 'BSRmKKVYrJGEJ907fGpL4H5pVBuCTKt4ayOuT3F6qfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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