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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b935332a85f321fe24c8053b62a824850705e6ff9f586981d6ddf93357d3e0' 
  AND token = 'v1lNb4QJB1/5rSZwn80mrXL6eGNaapDXi0Mo39/7d98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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