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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa761e96ff1f229ab3dc473c5c4f7b32756b59b168dffb5a6900c5fce67cada8' 
  AND token = 'dNXF1SQEVUSCw5FktbLgqhBLghkUQG8P3EfCtUNffwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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