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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f73dac95137cd4a60ae75fb57d98e28b16fe418c16a33fb77747161b8a2df9' 
  AND token = 'jUodYHERRmMb0OZgs0EnOy4E61jIzMfUyt8CSzUVcDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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