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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7fa0d3b0c9f731a6c9f9794a8de1e6b445dbf6bc08604feb5c3e1911d39440' 
  AND token = 's1sJ+vF+XrszL8L0ce2kW9iiRgQUcpVjPVWhqk+zd8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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