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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499383ece3c66dff56c3429d38362d7b382875264a2e1d3b5515291668a68099' 
  AND token = 'Oe9f+8pOxkZRTIeitUGW0xJiqTOldUtMqussGpx2v/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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