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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e2ddc123c8f23c9ac874fc7d10eca13b0c796ab2af81b208816fd5e85922aa' 
  AND token = 'uymtk+J60n9b2EpujB+v8Ki7RwIuH2+EHKAscLP6xyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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