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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb41c32f694e37e895a30a36a963b2e7c6c7ac724ff4fe5e91adfeb7eea577f' 
  AND token = 'iAkTsfF6HwZoT2+GQkEsflnsPJq/KHovgXyF68AQbZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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