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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2008df823e7e55be65205f27e7d3eb78be6ce6f6b89f9546d912ff7c026d9d' 
  AND token = 'SSjuZOZ97slnr5hd9BtcXaQ957FGdp0Pm0y2IiGa7q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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