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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5aeed714f491de110bd158240bb3f7642f93d578cb89e5d393271fde8cc80e' 
  AND token = 'jOfRPIbavfE/K96jsyAhbdk/F5pcAvPunOfqoUT0P+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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