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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a8020e1c40d3bf860bb778cf4cf68db5b1fa5e4d265665cad0c2476e98cdf1' 
  AND token = 'KE74ai1ecO6fo42RX+Q/A9IJ6tzAr++G6Tdgb2KuCtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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